SpeTool Upcut Spiral Router Bits Extra Long (4 inch) with 1/2 Inch Shank , 1/2 Cutting Diameter Solid Carbide CNC Router Bits End Mill for Wood Mortises and Cutting Dadoes Carving

The bit I got was out of balance. So severely that at 12000rpm it was wobbling by 0.3mm.

Using this on my CNC lathe. Works great. So sharp you need to be careful just handling the bit. (Voice of experience.)

These router bits are not square. In other words, the top is not perpendicular to the sides so if they are used for something like a dado or finger joint you will not get a square cut. I have tried several and they were all the same.

Perfectly smooth and fast cut through 2 of Walnut

I been using this router bit for years, like the quality and the price, will be buying the same in a regular basis

Used it only once thus far. Cutting 2 cherry. Very sharp, low noise, low vibration. Good enough for me.

Used this on a recent desk project. Using several passes with this bit I was able to get nice clean cuts. The bit is very sharp so handling with care is needed.

So far so good, had no problem to mortise through oak. Big question is how long will it stay sharp for? Good product for the buck.

Produced an extremely clean cut without burning or tear out.

Great stuff. Gets the job done for sure.